Fair Value Measurement of Assets and Liabilities - Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment securities:
Equity securities	$ 73,071	$ 64,464
Trading debt securities	3,996	3,973
Available for sale debt securities:
Available for sale debt securities	2,602,260	1,296,576
Loans held for sale	17,153	20,640
Non-recurring fair value measurements:
Unpaid principal balances of loans held for sale	16,900	20,100
U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	296,061	288,157
U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	23,212	23,702
Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	201,846	191,690
Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	1,895,868	626,572
Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	185,273	166,455
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements
Investment securities:
Equity securities	23,985	23,307
Trading debt securities	3,996	3,973
Available for sale debt securities:
Available for sale debt securities	296,061	288,157
Loans held for sale	0	0
Other assets	0	0
Total assets	324,042	315,437
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	296,061	288,157
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring fair value measurements
Available for sale debt securities:
Loans held for sale	0
Non-recurring fair value measurements:
Non-performing loan held for sale		0
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring fair value measurements | Performing
Available for sale debt securities:
Loans held for sale	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring fair value measurements | Non-performing
Available for sale debt securities:
Loans held for sale	0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements
Investment securities:
Equity securities	0	0
Trading debt securities	0	0
Available for sale debt securities:
Available for sale debt securities	2,306,199	1,008,419
Loans held for sale	17,153	20,640
Other assets	305,429	466,227
Total assets	2,628,781	1,495,286
Liabilities
Other liabilities	313,791	488,103
Total liabilities	313,791	488,103
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	23,212	23,702
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	201,846	191,690
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	1,895,868	626,572
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	185,273	166,455
Significant Other Observable Inputs (Level 2) | Non-recurring fair value measurements
Available for sale debt securities:
Loans held for sale	826,048
Non-recurring fair value measurements:
Non-performing loan held for sale		10,000
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	826,048	10,000
Significant Other Observable Inputs (Level 2) | Non-recurring fair value measurements | Performing
Available for sale debt securities:
Loans held for sale	817,298
Significant Other Observable Inputs (Level 2) | Non-recurring fair value measurements | Non-performing
Available for sale debt securities:
Loans held for sale	8,750
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements
Investment securities:
Equity securities	0	0
Trading debt securities	0	0
Available for sale debt securities:
Available for sale debt securities	0	0
Loans held for sale	0	0
Other assets	0	0
Total assets	0	0
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Non-recurring fair value measurements
Available for sale debt securities:
Loans held for sale	0
Non-recurring fair value measurements:
Non-performing loan held for sale		0
Collateral dependent loans	119,767	90,580
Foreclosed assets	8,783	1,444
Total	128,550	92,024
Significant Unobservable Inputs (Level 3) | Non-recurring fair value measurements | Performing
Available for sale debt securities:
Loans held for sale	0
Significant Unobservable Inputs (Level 3) | Non-recurring fair value measurements | Non-performing
Available for sale debt securities:
Loans held for sale	0
Fair Value | Recurring fair value measurements
Investment securities:
Trading debt securities	3,996	3,973
Available for sale debt securities:
Available for sale debt securities	2,602,260	1,296,576
Loans held for sale	17,153	20,640
Other assets	305,429	466,227
Total assets	2,964,330	1,822,849
Liabilities
Other liabilities	313,791	488,103
Total liabilities	313,791	488,103
Fair Value | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	296,061	288,157
Fair Value | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	23,212	23,702
Fair Value | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	201,846	191,690
Fair Value | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	1,895,868	626,572
Fair Value | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	185,273	166,455
Fair Value | Non-recurring fair value measurements
Available for sale debt securities:
Loans held for sale	826,048
Non-recurring fair value measurements:
Non-performing loan held for sale		10,000
Collateral dependent loans	119,767	90,580
Foreclosed assets	8,783	1,444
Total	954,598	102,024
Fair Value | Non-recurring fair value measurements | Performing
Available for sale debt securities:
Loans held for sale	817,298
Fair Value | Non-recurring fair value measurements | Non-performing
Available for sale debt securities:
Loans held for sale	8,750
Fair Value | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Recurring fair value measurements
Investment securities:
Equity securities	23,985	23,307
Fair Value | Significant Unobservable Inputs (Level 3)
Investment securities:
Equity securities	37,579	29,031
Fair Value | NAV | Recurring fair value measurements
Investment securities:
Equity securities	$ 11,507	$ 12,126